The Obama administration threatened to pull out of talks with Russia over a collapsed cease-fire deal in Syria and renewed a debate over whether to give rebels more firepower to fend off a stepped-up Russian and Syrian assault on Aleppo.

Behind the scenes, coordination between the U.S. and Turkey broke down at senior levels, according to officials, indicating the countries weren’t as aligned on the mission against Islamic State as their statements suggested.

The Federal Bureau of Investigation is preparing to hand over to Congress interview notes from its probe of Hillary Clinton’s emails, as well as copies of the classified emails at the heart of the case.

The Obama administration released for the first time internal estimates of the number of civilians killed in strikes against suspected terrorists, but it didn’t disclose many details because officials said those were still secret.

The U.S. asked Moscow to force the Syrian regime to ground its air force as part of a proposal that could lead to greater cooperation with Russia in the war-torn country, officials familiar with the offer said.

A plan by President Obama to shift control of U.S. drone campaigns around the world gives the military an expanded responsibility but retains a CIA role, according to officials briefed on the secret arrangement.

The gunman responsible for the worst mass shooting in U.S. history was twice the subject of terrorism-related investigations by the FBI in recent years, but those cases were closed after interviews with him proved inconclusive.

The Pentagon is probing a friendly-fire bombing of a Syrian rebel unit trained by the U.S., an incident that raises questions about renewed Pentagon efforts to build local forces to battle Islamic State.

Mullah Akhtar Mansour was returning from Iran, where he had been visiting family, and driving through an area of Pakistan that is normally off limits to U.S. drones when his Toyota Corolla was struck by Hellfire missiles.